Cryo-EM structures of recombinant human sodium-potassium pump determined in three different states

Yingying Guo, Yuanyuan Zhang, Renhong Yan, Bangdong Huang, Fangfei Ye, Liushu Wu, Ximin Chi, Yi Shi and Qiang Zhou ()
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Yingying Guo: Westlake University
Yuanyuan Zhang: Westlake University
Renhong Yan: Westlake University
Bangdong Huang: Westlake University
Fangfei Ye: Westlake University
Liushu Wu: Westlake University
Ximin Chi: Westlake University
Yi Shi: Westlake University
Qiang Zhou: Westlake University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Sodium-Potassium Pump (Na+/K+-ATPase, NKA) is an ion pump that generates an electrochemical gradient of sodium and potassium ions across the plasma membrane by hydrolyzing ATP. During each Post-Albers cycle, NKA exchanges three cytoplasmic sodium ions for two extracellular potassium ions through alternating changes between the E1 and E2 states. Hitherto, several steps remained unknown during the complete working cycle of NKA. Here, we report cryo-electron microscopy (cryo-EM) structures of recombinant human NKA (hNKA) in three distinct states at 2.7–3.2 Å resolution, representing the E1·3Na and E1·3Na·ATP states with cytosolic gates open and the basic E2·[2K] state, respectively. This work provides the insights into the cytoplasmic Na+ entrance pathway and the mechanism of cytoplasmic gate closure coupled with ATP hydrolysis, filling crucial gaps in the structural elucidation of the Post-Albers cycle of NKA.

Date: 2022
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DOI: 10.1038/s41467-022-31602-y

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